[s-cars] Coolant question

[mathieu.mouraud at free.fr]

Hi Fellows,

After a slight mishap (coolant loss....) I have filled back with water. I know,
I know... Actually the problem I had is worth mentionning : there is a
temperature sending unit located on one cooling hose that runs along the
firewall. It has a blue connector. This bad boys tells how warm the coolant is
to the a/c system. Well, believe or not, but the sending unit, T shaped, had
slowly but surely started to become brittle. At the worst moment (cruising up
the Champs Elysées) it decided to let go, engulfing the car in a magnificient
white cloud. I was mortified.
My question is do I have to use G11 (Audi coolant) or can I use any coolant ?
Also where is the bleeding bolt/screw/nut ?
Thanks !

Matt